Adding Cast Support (#489)

Adds Google Cast Speaker Support!

A new button is now present in the bottom left of the player screen. Pressing this button will prompt the user to pick a Cast enabled speaker. Once a speaker is selected, the player controls in Jellify will control the playback of the Cast speaker.

android/app/src/main/AndroidManifest.xml

@@ -36,5 +36,8 @@
             <action android:name="android.media.browse.MediaBrowserService" />
         </intent-filter>
       </activity>
+      <meta-data
+          android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
+          android:value="com.reactnative.googlecast.GoogleCastOptionsProvider" />
     </application>
 </manifest>

android/app/src/main/java/com/jellify/MainActivity.kt

@@ -5,6 +5,11 @@ import com.facebook.react.ReactActivity
 import com.facebook.react.ReactActivityDelegate
 import com.facebook.react.defaults.DefaultNewArchitectureEntryPoint.fabricEnabled
 import com.facebook.react.defaults.DefaultReactActivityDelegate
+import com.reactnative.googlecast.api.RNGCCastContext
+import android.os.Bundle
+import androidx.annotation.Nullable
+
+
 
 class MainActivity : ReactActivity() {
 
@@ -20,5 +25,12 @@ class MainActivity : ReactActivity() {
    */
   override fun createReactActivityDelegate(): ReactActivityDelegate =
       DefaultReactActivityDelegate(this, mainComponentName, fabricEnabled)
+
+
+  override fun onCreate(@Nullable savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        // lazy load Google Cast context (if supported on this device)
+        RNGCCastContext.getSharedInstance(this)
+  }
 }